Telephone subscriber line looping circuit

Details Telephone subscriber line looping circuit Telephone subscriber line looping circuit

1982-03-30

1984-10-09

George, Keith E.

H04M 176

Patent

active

044763522

ABSTRACT:
A line looping circuit for connection between the wires of a subscriber's line via the hook contact and in parallel with further equipment of the subscriber's set. The circuit comprises the series arrangement of the main current path of one or two field effect transistors and a resistor, the gate of each field effect transistor being connected to the end of the resistor remote from that field effect transistor. The circuit has a low resistance to small currents and a high resistance to high currents.

REFERENCES:
patent: 3973082 (1976-08-01), van der Plaats
patent: 4143247 (1979-03-01), Yoshitoshi et al.
patent: 4167654 (1979-09-01), Bolus et al.
patent: 4286120 (1981-08-01), Sublette
patent: 4341991 (1982-07-01), Geboers et al.
Markus, John; Electronics Circuits Manual; 1971, McGraw-Hill; New York; pp. 181 and 673.

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